SU0004910 SSCRPT - Laserfiche WebLink

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There are no records of above ground, or under ground (AST/UST) storage tanks at the subject property address. This is illustrated on the attached GeoTracker Site Map, which shows no Underground Storage Tanks (USTs) or Leaking Underground Storage Tanks (LUSTs) tanks near ' � the site. The EHD Envisions Program denotes an Underground Storage Tank (UST) site at 3359 Fine Road, approximately three miles to the northeast of the property. This site can be considered crossgradient and impossible to impact the subject site due to the distances involved. Potential , environmental impacts from past, present or future facilities within a one mile radius is unknown at this time, but highly unlikely. Two sources of information which attempt to document and define on-site and surrounding past land use'were also utilized. The first is the use of aerial photographs. Aerial photographs of the subject area from 1970 through 1977 found on USDA Soil Maps show the property to be open, with ag production to the north. The USDA Map shows the soil to consist of a San Joaquin sandy loam (#236). Typically, these soil types are well drained with slow permeability and an underlying hardpan. There are sufficient soil "fines"to impede rapid percolation so treatment of septic effluent can occur before reaching the water table, unlike what would be encountered with a very sandy soil. The second source of information can be found on USGS maps. The property is 1 j located within the Peters Quadrangle map, which is found in the Appendix and shows only the referenced buildings. As stated by the Tivald's, only the herbicide Round-up® is applied to the homesite property during the spring and summer times of the year. No other pesticides are applied to any portion of the 9.24 3 3, acres. Therefore, an evaluation of environmental fate data for this specifically applied agrichemical residues as a nonpoint source of potential contamination was completed. In reviewing the enviromnental fate data of agrichemicals used today, most of the half-lives are extremely short and are measured in hours. The science of pesticide residues in soil, air, surface water and groundwater is extremely complex and variable. Environmental models that attempt to predict pesticide behavior and transport in the environment are beyond the scope of this investigation. However, pesticides with long half-lives that may have been used or drifted onto the property decades ago, primarily DDT, may be of a slight concern. DDT was used extensively throughout the agricultural fields of the San Joaquin Valley and degradates of DDT can be found in nearly all these soils. Previous Exposure Assessments made on typical San Joaquin Valley soils suggest an extremely low probability of adverse health effects from soil DDT/DDD and DDE concentrations (if the concentrations even exist). It can be reasonably concluded that any DDT, DDE and DDD concentrations that may be present on the property will continue to degrade as reported in the published environmental fate data. The environmental fate data for DDT and its degradates DDD and DDE are illustrated below: Page -4- Chesney Consulting